Saga of the Swamp Thing v04 (2013)

"Continuing the collection of master comics writer Alan Moore's award-winning run on THE SAGA OF THE SWAMP THING, this fourth volume brings Swamp Thing's quest for self-discovery with the mystic John Constantine to its shattering conclusion.
A harbinger of doom has been released with the sole charge of waking an evil beyond comprehension, and Swamp Thing, John Constantine, Deadman, The Phantom Stranger, Etrigan the Demon, The Spectre and other masters of the occult must unite against the dark forces that threaten to eradicate Heaven's light.
Collecting SWAMP THING (1982-1996) #43-50."